Henry poydenot



UNITED STATES PATENT OF ICE.

HENRY POYDENOT, OF BAYOfiNE, FRANCE.

EATING-POWDER.

SPECIFICATION forming part of Letters Patent No. 455,851, dated July 14,1891. Application filed April 4, 1891. Serial No. 387,667. (Nospecimens.) Patented in France December 23, 1887, No. 185,907..

To all whom, it may concern.-

Be it known that I, HENRY POYDENO'I, of Bayonne, France, have invented acertain new and useful Improvement in Eating Powders or Compounds forPreparing Hides for Tannin g,(for which I have obtained a patent inFrance, No. 185,907, dated December 23,-1887;) and I do hereby declarethe following to be a full, clear, and exact description thereof.

My invention has relation to the tanning of leather; and it consists ina bating powder, mixture, or compound composed of the ingredients and inthe proportions substantially as hereinafter set forth.

In the tanning of leather there are a number of difficulties to beovercome. The pores of the skin should be opened without greatlydistending them. A rapid tanning should be obtained by gradual andprogressive extension of the skin without, however, shriveling orburning the hide or any portion thereof.'

These are essential requisites toward producing a skin of great firmnessand good quality.

The object of my invention is to provide a powder, mixture, or compoundwhich will answer all the requirements involved in the successfulpreparation of hides to be tanned, and which at the same time shallgreatly accelerate the process and shorten the time consumed incompleting the tanning.

I will now describe my improved powder or composition, so that othersskilled in the art to which my invention appertains may make and use thesame.

The ingredients of which my improved powder is composed are pulverizedgentianroot and bichloride of mercury or corrosive sublimate commixedand commingled in the proportions, preferably, of about nine hundredparts of gentian-root to one hundred parts of bichloride of mercury orcorrosive sublimate. The gentian-root, before being commixed with thebichloride of mercury or corrosive sublimate, is preferably pulverizedand finely ground. The whole is then mixed together in about theproportions described and thoroughly amalgamated. The composition isthen complete and ready for use or to be packed for shipment.

In employing my improved powder in the operation, I use, preferably, theproportion of one kilogram of powder to one thousand cording to theirWeight, and the. tanning of heavy hides in from thirty to sixtydays, ao-

' cording to their weight.

Hides to be treated after having gone through the ordinary process ofthe beam and being well depilated are ready to go into the hate, whichis prepared substantially as follows: In a clean tank sufficientquantity of water is introduced to allow the hides to float freely andto be always well submerged. In this tank of water'is then introduced aquantity of my improved powder or composition in proportion to theweight of hides to be bated, and the water is then Well agitated inorder to dissolve the powder, though some may remain on the surface ofthe water without materially interfering with the operation. The bate isthen ready to receive the hides, which are put in one by one and spreadout as much as possible.

The length of time during which the skins As an illustration, lightcalf-skins, up to twelve pounds, should preferably remain in thebate-from ten to twelve hours; heavy calf -skins, kips, and cordovans,preferably.

from fourteen to sixteen hours; cow, steer,

and bull hides, preferably from sixteen to eighteen hours, &c.

Havingthus described my invention, what I claim, and desire to secure byLetters Patent, 1s

The within-described powder or mixture, consisting of gentian-root andbichloride of mercury or corrosive sublimate,commixed in the proportionssubstantially as described.

In witness whereof I have hereunto set my hand this 10th day of March,A. D. 1891.

HENRY POYDENOT. Witnesses:

BORDET, LABADIE Lnoy.

